exclude pk_only models from beeing save_related

ormar/models/model.py

@@ -191,7 +191,7 @@ class Model(ModelRow):
             value = [value]
 
         for val in value:
-            if not val.saved or save_all:
+            if (not val.saved or save_all) and not val.__pk_only__:
                 await val.upsert()
                 update_count += 1
             if follow:

tests/test_queries/test_deep_relations_select_all.py

@@ -155,4 +155,4 @@ def create_test_database():
 async def test_saving_related_fk_rel():
     async with database:
         async with database.transaction(force_rollback=True):
-            await Report.objects.select_all(follow=True).all()
+            await Report.objects.select_all(follow=True).all()